Role of the solvophobic effect on micellization

Moyá, Marı́a Luisa; Rodrı́guez, Amalia; Graciani, Marı́a del Mar; Fernández, Gaspar

doi:10.1016/j.jcis.2007.07.035

Cited by 93 publications

(73 citation statements)

References 54 publications

(32 reference statements)

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“…The influence of some other co-solvents like glycerol and ethylene glycol on the phase behavior and micellization of surfactant solutions is often reported in the literature [1][2][3][4][5][6]. Recently, we have shown a direct relation between vesicle swelling and the dielectric constant of the mixed solvent, and we have found that the change in the dielectric constant induced by glycerol addition or changing the temperature has the same influence on the swelling of vesicle phase [10].…”

Section: Introductionmentioning

confidence: 84%

“…The β values show a strong dependence on the 1,3-butanediol concentration; it increases with the 1,3-butanediol addition at 25°C. 1,3-Butanediol addition leads to a decrease in the charge density at the micellar surface, and an increase in β value is expected [2].…”

Section: Micellization Of Ctab In 13-butanediol/water Mixed Solventsmentioning

confidence: 99%

“…The static dielectric constant, ε, also called permittivity, is often considered to describe the polarity of binary mixtures [2]. Generally, 1,3-butanediol has a static dielectric constant, ε, lower than water at room temperature, and the value of dielectric constant for 1,3-butanediol at 25°C is 28.48 whereas for water is 78.53.…”

Section: Phosphocholine In 13-butanediol/water Mixed Solventsmentioning

confidence: 99%

“…Adding organic solvent to water will change the solvent quality and provide an opportunity to study the role of the so-called solvophobic effect [1][2][3]. It has been reported that the adsorption parameters obtained in both water and pure ethylene glycol are very similar and the surfactant aggregation can be controlled by tuning solvent and surfactant properties through appropriate mixtures of co-solvents and water [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the adsorption parameters obtained in both water and pure ethylene glycol are very similar and the surfactant aggregation can be controlled by tuning solvent and surfactant properties through appropriate mixtures of co-solvents and water [4][5][6]. It is obvious that the solvent properties can be changed using different methods: (1) mixing different solvents, (2) adding additives, and (3) changing some physical parameters like temperature.…”

Section: Introductionmentioning

confidence: 99%

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1,3-Butanediol as a co-solvent for the surfactant solutions

Abdel‐Rahem

2012

Colloid Polym Sci

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A biphasic solution containing water and precipitated phosphocholine (PC) is presented in order to investigate the consequences of 1,3-butanediol addition on the phase behavior of PC at different 1,3-butanediol concentrations and temperature values. With increasing the concentration of 1,3-butanediol in the mixed solvent at room temperature, the biphasic solution converts into turbid phase, two phase, and finally to a clear phase that is birefringent when viewed between two crossed polarizers. The birefringent phase moves to lower 1,3-butanediol contents at higher temperature values. The birefringent phase was observed via polarizing microscopy, and its rheological parameters were measured with cone plate method. In high 1,3-butanediol contents, solutions with 2.5% of PC behave as a gel with high yield stress value. The micellization of cetyltrimethyammonium bromide (CTAB) in a series of 1,3-butanediol/water mixed solvent at room temperature was also investigated. From the conductivity measurements, the critical micelle concentration and the degree of counterion dissociation of CTAB were obtained as a function of 1,3-butanediol. Standard free energy of micellization, as a function of 1,3-butanediol contents, was also estimated and discussed. Gibbs energies of micellization were found to have a good correlation with dielectric constant and Gordon parameters.

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Section: Introductionmentioning

confidence: 84%

Section: Micellization Of Ctab In 13-butanediol/water Mixed Solventsmentioning

confidence: 99%

Section: Phosphocholine In 13-butanediol/water Mixed Solventsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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1,3-Butanediol as a co-solvent for the surfactant solutions

Abdel‐Rahem

2012

Colloid Polym Sci

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The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

et al. 2012

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We used fluorescence probing, ζ potentials, and dynamic light scattering measurements to study the interactions between the zwitterionic surfactant N-hexadecyl-N,N-dimethylammonio-1-propanesulfonate (SB-16) and three ionic liquids (ILs), 1-ethyl-3-methylimidazolium ethylsulfate ([C(2)mim][C(2)SO(4)]), 1-ethyl-3-methylimidazolium n-butylsulfate ([C(2)mim][C(4)SO(4)]), and 1-ethyl-3-methylimidazolium n-hexylsulfate ([C(2)mim][C(6)SO(4)]). The three ILs have the same cationic part and their anionic parts differ only in the length of the alkyl chain. The aim of our work is to offer a comparative study and establish the role of the alkyl chain length of the anion of ILs on 1) the incorporation of these anions in the zwitterionic micelles of SB-16 (selectivity of anions) and 2) the physicochemical properties of aqueous solutions of SB-16. Results show that, at lower concentrations (i.e. ≤20 mM), the different ILs modify the properties of the aqueous SB-16 solution in similar manner. All of them bring about a decrease in the critical micelle concentration (CMC) and also in size, and increase the aggregation number of the SB-16 micelles; these effects are more dramatic when [C(2)mim][C(6)SO(4)] is used as the additive rather than [C(2)mim][C(4)SO(4)] and [C(2)mim][C(2)SO(4)]. It is proposed that, in case of [C(2)mim][C(6)SO(4)], the presence of a hexyl chain on the hexylsulfate ion allows the ion to align itself with the tail part of SB-16, whereas, in the case of [C(2)mim][C(2)SO(4)], the presence of ethyl chain in the ethylsulfate ion is not sufficient to bring about a similar alignment of the ethylsulfate anion with the tail part of SB-16. This difference in the location of the anions of the ILs is responsible for the different behavior of the ILs.

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Study of the reaction of methyl 4‐nitrobenzenesulfonate and Br⁻ in water–glycerol cationic micellar solutions

Graciani¹,

Rodrı́guez²,

Fernández³

et al. 2008

Int J of Chemical Kinetics

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The reaction of methyl 4-nitrobenzenesulfonate (MNB) and Br − has been studied in water-glycerol (GLY) alkyltrimethylammonium bromide micellar solutions, with the weight percentage of glycerol up to 50%. A pseudophase kinetic model was used for quantitatively discussing the kinetic data. Results showed that the equilibrium-binding constant for the organic substrate molecules to the cationic micelles decreases upon increasing the amount of glycerol present in the micellar reaction media. The second-order rate constant of the reaction in the micellar pseudophase is practically independent of wt% of GLY. Similar results were found in other water-organic solvent alkyltrimethylammonium bromide micellar solutions for the same process. However, the dependence of the reaction rate, for a given surfactant concentration, on the wt% of organic solvent is weaker for glycerol than for the other organic solvents. This was explained by considering that the cationic micellar ionization degree is nearly independent of wt% GLY. As a consequence, bromide ions concentration in the interfacial region (the reaction site) does not change by varying wt% of GLY. C

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Role of the solvophobic effect on micellization

Cited by 93 publications

References 54 publications

1,3-Butanediol as a co-solvent for the surfactant solutions

1,3-Butanediol as a co-solvent for the surfactant solutions

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

Study of the reaction of methyl 4‐nitrobenzenesulfonate and Br⁻ in water–glycerol cationic micellar solutions

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Role of the solvophobic effect on micellization

Cited by 93 publications

References 54 publications

1,3-Butanediol as a co-solvent for the surfactant solutions

1,3-Butanediol as a co-solvent for the surfactant solutions

The Chameleon‐Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles

Study of the reaction of methyl 4‐nitrobenzenesulfonate and Br− in water–glycerol cationic micellar solutions

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Study of the reaction of methyl 4‐nitrobenzenesulfonate and Br⁻ in water–glycerol cationic micellar solutions